Rabbi Shmuel Halevi Wosner: When the “fasten seatbelts” sign is lit, one should sit down. One should refrain from davening in large groups; it is preferable to daven in small groups in the seating area. The same is true for Shemoneh Esrei. If there is a possibility of standing beside one’s seat, not in the aisles, then that is preferable. If this is not possible Shemoneh Esrei can be recited while seated.
Rabbi Ovadia Yosef davens individually on a plane and not together with a group so as not to disturb others and for fear of robbing another person’s sleep.
Rabbi Shlomo Zalman Auerbach: One should say Shemoneh Esrei on a plane while seated and not while standing in the aisles, where he will disturb others. Rav Shlomo Zalman was not supportive of conducting minyanim during a flight because it disturbs the rest of the passengers.
Rav Breuer advised daveining in your seat to avoid annoying others and blocking the aisles.
Above Paraphrased